BIO 135 HUMAN ANATOMY AND PHYSIOLOGY I LABORATORYLAB # 9 NERVOUS TISSUE AND SPINAL CORD1.HISTOLOGY OF NERVOUS TISSUE2.GROSS ANATOMY OF SPINAL CORD3.CROSS SECTION OF SPINAL CORD4.REFLEXES5.LAB REP # 8 NERVOUS TISSUE AND SPINAL CORDIntroductionThe nervous system is the master integrating and coordinating system, continuously monitoring andprocessing sensory information both from the external environment and within the body. Every thought,action and sensation is a reflection of this activity. The nervous system is made of central nervoussystem, or CNS, consisting of brain and spinal cord and the peripheral nervous system or PNS, whichincludes cranial and spinal nerves, sensory receptors and clusters of nerve cells. The nervous tissue isjust made up of two principal cells: neurons and neuroglia.HISTOLOGY OF NERVOUS TISSUENeurons or nerve cells are the basic structural and functional units of the nervous system. They aremade of three basic parts: dendrites or receptive region of neurons, are usually many in number andunmyelinated, cell body also called perikaryon or soma, the major biosynthetic region of the neuron andthe axon or conducting region of neuron, single and may be myelinated or unmyelinated.Nervous tissue•Specialized for communication by electrical and chemical signals•Neurons (nerve cells) detect stimuli, respond quickly, and transmit coded informationrapidly to other cells•Neuroglia (glial cells) protect and assist neurons, are the “housekeepers” of nervoussystemNeuron parts•
